EP2037195A2 - Appareil de réfrigération - Google Patents

Appareil de réfrigération Download PDF

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Publication number
EP2037195A2
EP2037195A2 EP08252985A EP08252985A EP2037195A2 EP 2037195 A2 EP2037195 A2 EP 2037195A2 EP 08252985 A EP08252985 A EP 08252985A EP 08252985 A EP08252985 A EP 08252985A EP 2037195 A2 EP2037195 A2 EP 2037195A2
Authority
EP
European Patent Office
Prior art keywords
evaporator
side region
disposed
refrigerating apparatus
flow route
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP08252985A
Other languages
German (de)
English (en)
Other versions
EP2037195A3 (fr
Inventor
Mao-Chuan Ko
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP2037195A2 publication Critical patent/EP2037195A2/fr
Publication of EP2037195A3 publication Critical patent/EP2037195A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/04—Preventing the formation of frost or condensate

Definitions

  • the invention relates to a refrigerating apparatus with an electric field-generating unit.
  • a refrigerating apparatus includes a storage compartment, a fan, and a refrigerating unit.
  • the storage compartment has an evaporator-side region and a cooling-side region that is used to store, for example, foods.
  • the refrigerating unit includes an evaporator disposed in the evaporator-side region of the storage compartment, a compressor, a condenser, and an expansion valve.
  • a thermodynamic cycle is performed in the refrigerating unit. In this cycle, a circulating refrigerant enters the compressor as a low-pressure vapor. The vapor is compressed and exits the compressor as a superheated high-pressure vapor.
  • the superheated vapor travels through the condenser which removes the superheat and then condenses the vapor into a liquefied refrigerant.
  • the expansion valve By passing through the expansion valve, the liquefied refrigerant expands from the high-pressure level in the condenser to the low-pressure level in the evaporator, thereby resulting in flash evaporation.
  • the liquefied refrigerant is completely vaporized in the evaporator by cooling the warm air from the cooling-side region, such that the cooling-side region can be maintained at a low temperature.
  • the resulting refrigerant vapor returns to the compressor to complete the cycle.
  • ice builds up on a conduit body of the evaporator.
  • the ice on the evaporator acts as an insulator and reduces heat transfer between the evaporator and the air passing therethrough, thereby reducing the efficiency of the refrigerating apparatus.
  • a heating element providing heat to melt ice off the evaporator is connected to the evaporator or is disposed at a position adjacent thereto. Normally, the heating element is controlled through a timer or a sensor.
  • the prior art approaches require the expenditure of heating and are time consuming. Since the temperature in the storage compartment is likely to be unstable using the heating approach for defrosting, most large chest freezers require manual defrosting.
  • an object of this invention is to provide a refrigerating apparatus that can overcome the aforesaid drawbacks associated with the prior art.
  • a refrigerating apparatus of the present invention comprises: a storage compartment, an air-circulating member, a refrigerating unit, and an electric field-generating unit.
  • the storage compartment includes an evaporator-side region and a cooling-side region.
  • the air-circulating member is disposed to establish an air circulation path in which a to-be-cooled air flows from the cooling-side region to the evaporator-side region along an onward flow route, and in which a cooled air flows from the evaporator-side region back to the cooling-side region along a backward flow route.
  • the refrigerating unit includes: an evaporator having a conduit body disposed in the evaporator-side region for evaporation of a refrigerant, and inlet and outlet members which are disposed upstream and downstream of the conduit body respectively to lead the refrigerant in and out of the conduit body, respectively; a compressor which is disposed outwardly of the storage compartment, which is positioned downstream of the outlet member to compress the vapor of refrigerant led out thereof for supply of liquefied refrigerant, and which is upstream of the inlet member for delivering the liquefied refrigerant towards the inlet member; and an expansion valve which is disposed downstream of the compressor and upstream of the inlet member for flash evaporation of the liquefied refrigerant.
  • the electric field-generating unit is disposed to impose a DC voltage over the onward flow route with a sufficient intensity such that water droplets entrained in the to-be-cooled air are charged so as to minimize cohesion of water droplets in the evaporator-side region, thereby reducing phenomenon of frosting on the conduit body of the evaporator.
  • a refrigerating apparatus in the first preferred embodiment, is shown to include a storage compartment 1, an air-circulating member 2, a refrigerating unit 3, and an electric field-generating unit 4.
  • the storage compartment 1 has an evaporator-side region 11 and a cooling-side region 12.
  • the air-circulating member 2 is disposed in the evaporator-side region 11 to establish an air circulation path in which a to-be-cooled air flows from the cooling-side region 12 to the evaporator-side region 11 along an onward flow route (A), and in which a cooled air flows from the evaporator-side region 11 back to the cooling-side region 12 along a backward flow route (B).
  • the refrigerating unit 3 includes an evaporator 31, a compressor 32, a condenser 33, and an expansion valve 34.
  • the evaporator 31 has a conduit body 311, and inlet and outlet members 312, 313.
  • the conduit body 311 is disposed in the evaporator-side region 11 for evaporation of a refrigerant.
  • the inlet and outlet members 312, 313 are disposed upstream and downstream of the conduit body 311 respectively to lead the refrigerant in and out of the conduit body 311, respectively.
  • the refrigerant evaporates in the conduit body 311 as the heat is transferred from the to-be-cooled air to the refrigerant through the conduit body 311 of the evaporator 31.
  • the cooled air then flows back to the cooling-side region 12 so as to maintain the storage compartment 1 of the refrigerating apparatus at a relatively low temperature.
  • the compressor 32 is disposed outwardly of the storage compartment 1, and is positioned downstream of the outlet member 313 to compress the vapor of refrigerant as a superheated high-pressure vapor.
  • the condenser 33 is also disposed outwardly of the storage compartment 1, and is positioned downstream of the compressor 32 and upstream of the expansion valve 34 to condense the superheated high-pressure vapor into a liquefied refrigerant.
  • the liquefied refrigerant is delivered towards the expansion valve 34 disposed downstream of the condenser 33 and upstream of the inlet member 312 for flash evaporation of the liquefied refrigerant, followed by delivery of the refrigerant into the evaporator 31.
  • the electric field-generating unit 4 includes a rectifier 43, a DC/DC converter 42, and a voltage grid 41 disposed upstream of the evaporator 31 in the onward flow route (A).
  • the number of the voltage grid 41 is not limited.
  • An external AC voltage is converted to a DC voltage using the rectifier 43, followed by amplification of the DC voltage to a desired high voltage using the DC/DC converter 42.
  • the high voltage is applied to the voltage grid 41 such that water droplets entrained in the to-be-cooled air passing through the voltage grid 41 are charged so as to minimize cohesion of water droplets in the evaporator-side region 11, thereby reducing phenomenon of frosting on the conduit body 311 of the evaporator 31.
  • the high voltage ranges from 3000V to 5000V.
  • the air-circulating member 2 is disposed on the onward flow route (A) and upstream of the electric field-generating unit 4.
  • the air-circulating member 2 is a ventilating fan.
  • Fig. 2 illustrates the second preferred embodiment of the refrigerating apparatus of this invention.
  • the second preferred embodiment differs from the previous embodiment in that the air-circulating member 2 is disposed on the backward flow route (B) and downstream of the evaporator 31.
  • the air-circulating member 2 is a ventilating fan.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Removal Of Water From Condensation And Defrosting (AREA)
  • Defrosting Systems (AREA)
EP08252985A 2007-09-12 2008-09-10 Appareil de réfrigération Withdrawn EP2037195A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW96134035A TW200912225A (en) 2007-09-12 2007-09-12 Defrost-free device for refrigerating system

Publications (2)

Publication Number Publication Date
EP2037195A2 true EP2037195A2 (fr) 2009-03-18
EP2037195A3 EP2037195A3 (fr) 2011-04-13

Family

ID=39930546

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08252985A Withdrawn EP2037195A3 (fr) 2007-09-12 2008-09-10 Appareil de réfrigération

Country Status (2)

Country Link
EP (1) EP2037195A3 (fr)
TW (1) TW200912225A (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1501111A1 (de) * 1965-02-26 1970-04-02 Gerhard Rausch Vorrichtung zur Verhinderung von Vereisung der Verdampfer bei Kuehlaggregaten in Kuehlschraenken,Kuehltruhen,Kuehlraeumen u.dgl.
JPS57172124A (en) * 1981-04-17 1982-10-22 Hitachi Ltd Heat exchanger of air conditioner
JPH06317366A (ja) * 1993-05-07 1994-11-15 Hitachi Ltd 冷凍庫の空気冷却器
DE10057006C1 (de) * 2000-11-17 2002-05-23 Friedhelm Meyer Verfahren und Vorrichtung zum Betreiben von Klima- und Kälteanlagen

Also Published As

Publication number Publication date
TW200912225A (en) 2009-03-16
EP2037195A3 (fr) 2011-04-13

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